Title:
METHOD AND DEVICE FOR SENSING FOREIGN MATTER IN FILM
Document Type and Number:
Japanese Patent JPH0611457
Kind Code:
A
Abstract:
PURPOSE: To provide a method and device for effectively sensing any photo- transmissive foreign matter(s) in a photo-transmissive film even when the film and foreign matters have the same color (including transparent).
CONSTITUTION: A film 1 is stretched in a sensing device for foreign matter(s) included in the film, wherein a light source 5 and a dark colored background member 6 are arranged on one side of the set film 1 while a photographing device 7 is installed on the other side of the film 1. The photographing device 7 is equipped with a processing part 9 which reads the transmitted light through the film 1 with the member 6 as the backdrop and judges whether the film includes any foreign matter(s).
Inventors:
UEHARA OSAMU
Application Number:
JP16962892A
Publication Date:
January 21, 1994
Filing Date:
June 26, 1992
Export Citation:
Assignee:
GUNZE KK
International Classes:
G01N21/89; G01N21/892; (IPC1-7): G01N21/89
Domestic Patent References:
| JPS63244173A | 1988-10-11 | |||
| JPS5566741A | 1980-05-20 |
Attorney, Agent or Firm:
Toshio Yasuda